Dynamo-electric machine.



L. A. PAPE'.

0 ELECTRIC) MA APPLI OOOOOOOOOOOOOOOOOOOOO 7.

' 927,274.' Patented July 6, 1909.'

y MO/LYVGS 1 v PATEN TGRA'I'IONUF N EW JERSEY, N'D TEE BULLOCK ELECTRIC MANUFAC'URENG COMPANY,

y A 'GGRTORATEON yOF GHR).

.9151eciiioeton of Letters Potent.

Application moo?. .tuvgiist 19, 190'?. Serial No. Simili?.

l To all whom it mer/y comme:

Be it .known that l, LAUREN@ A. Parri, a citizen-of the United Stetes, residi at NorU wood, .in the county of Hemiltori en State-of Ghio, have invented oertain end useful Improvements 1in Dynamo Electric Mechines, of which the following is a fiulhclear, and exact speoiicetion.

My invention ,relates to dynamo-electric' A often found in the end-turns o'thecoils. In

i may be used and still come Within the broadv cases where :wedges ere used for tightenin the end-turns and holding them in place, Ial that is necessary in order to make the loosened coils tight again is to drive seid wedges farther in.

It is the object of my present invention to provide means for automatically' 'tightening coils which become loosened. With my invention this is accomplished by an automatic follow-up device, which is preferably oper ated by the action of the same centrifugal force which may tend to loosen the coils. In

the preferred embodiment of my inventionv the centrifugal force acts through radially movable Wedges to drive in the longitudinally movable Wedges which hold the end-turns in place. AHowever, .many other desired means sco e of my invention.

he novel featuresof my invention Will appear in the following description and accompanying drawing: end -will be particularly pointed out in 'the e aims. i

Figure l shows a partial longitudinal section of the rotor oi e @lyrisme-electric maehinein which my invention is embodied; Fig. 2 is e section on the line 2--2 oi F' l, with the end turns partly broken oivsyilig.' 3 is e fragmentary view somewhat similar to Fig.v 1, showing the coil-tightening wedges es ooiirANY, A cosv in another position; and Fig. 4 is en. isol metric view' of one oi the Wedges.

The body 10 of the rotating member oi' a dynammelectric machine is provided with a shaft or shaft projection l. vln this case this rotating member'is the field member and is sl ted longitudieally to receive 'theusuel iel windings, the end-turns of seid field windings being shown at 12. As here shoe/iii these -Wiridinvs are oi edgewise wound strap conductor, tllie end turns oi diiierent grou ,e of windings are separated by insulating looks 13, and insulation lll and 15 is provided at the outer and inner surfaces ot ,the end-tui`fns- ,An end-ring 16 at each end surrounds the end-turns l2 and holds them in place. The end-turiis are held against the end rings and are tightened by longitudinally movable Wedges I7. driven/in between them and the conical Wedge support 12S in grooves 18a of the latter. a 1

In assembling the machine, after the longitudinally movable wedges l? lieve been driven in es iai' possible, grooved radially movable wedges 19 are laced against and over their vends end are ield in place by a collar 20, fitting closely around the shaft il and itself held in place by a nut 2l. The two sets of Wedges form the automatic follow-up device for tightening the end-turns.

In the operation oi the machine the action of the same centrifugal force which may help to cause the end-turns l2 to become loosened, forces the radially movable wedges lll outn wardly from the `position shown in Fig. l ton Ward that shown in F1' 'This outward movement of the radially movable vfeilges 19 forces the longitudinelly movable Wedges 17 farther `'into place, causing them immediately to tighten up the coils it' the letter have become loosened.l The angles oi' the Wedges 17 and 19 ere preferably no greater than the angle oi repose of the materiels of- Which they are mede, so that when the ma chine is stopped the wedges do not retiirri to their initial ositions.

Many mo ilieations in the precise etrange ment here shown and described. may be made without departing from the spirit end scope of my invention arid all such i ein; to cover vin the following eleimszw- "n @Ew-Lviv mammina, ilw wmblml'rifm nl n looting lwymul s ilu l um l ymul smid r l l Tn :l wie? w1" :L ffl) huw-electric. mm L' une. Hw combmfll'wn o a slobli-erl maf' 101310 .l JMU' l la N if li A. 

